yeah refraction is right. I am a bit confused because it looks like you have all the shaders for you model in there. The parametric map looks like it could be the cornea from the little ball, but you only want to do this to the cornea shader.I brought mine in via daz obj for this and merged groups so mine could be setup differently.If you look I just have multichannel then texture map.Set that shader under reflection to 16% value.

No need to think outside the box....
    Just make it invisible.